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Abstract

We report high power mid-infrared (mid-IR) supercontinuum (SC) generation in a single-mode ZBLAN (ZrF4-BaF2-LaF3-AlF3-NaF) fiber with up to 21.8 W average output power from 1.9 to beyond 3.8 μm pumped by amplified picosecond pulses from a single-mode thulium-doped fiber (TDF) master oscillator power amplifier (MOPA). The optical-optical conversion efficiency from the 793 nm pump laser of the last stage thulium-doped fiber amplifier (TDFA) to mid-IR SC output is 17%. It is, to the best of our knowledge, the highest average power mid-IR SC generation from a ZBLAN fiber to date.

Figures (5)

(a) Spectrum of the picosecond fiber oscillator at 42 MHz. Inset
shows pulse train of the picosecond fiber oscillator. (b) Pulse
autocorrelation trace of the fiber preamplifier at average output
power of 100 mW.

(a) Spectrum of the picosecond fiber oscillator at 93.6 MHz. Inset
shows pulse train of the picosecond fiber oscillator. (b) Pulse
autocorrelation trace of the fiber preamplifier at average output
power of 120 mW.

(a) TDFPA output power and SC output power from ZBLAN fiber versus
793 nm pump power at 93.6 MHz. ηc: Optical-optical
conversion efficiency. (b) Output spectrum of the TDFPA at average
output power of 12.7 W, 26.6 W and 42 W. (c) Output spectrum of SC
from ZBLAN fiber at average output power of 8.2 W, 15.5 W and 21.8
W.